Bio 5A Midterm 1

During expression of genes in cells:
A. Translation of RNA makes DNA
B. DNA gets transcribed to make RNA
C. Protein is transcribed to make RNA
D. Protein is made by translation of DNA
E. RNA undergoes transcription to make protein
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Insects like water striders can walk on the surface of a pond without breaking
the surface because:
A. Has a lower density when it is a solid than when it is a liquid.
B. Causes some types of compounds to separate into ions.
C. Sticks to other molecules mostly through van der Waals interactions.
D. Had a relatively high specific heat capacity compared to other liquids.
E. Forms a network of noncovalent interactions with itself.
Which of the following is a correct statement about covalent bonds?
A. Atoms of similar electronegativity (like C and H) will form a highly polar covalent bond between them.
B. Hydrogen bonds are nonpolar covalent bonds.
C. Covalent bonds formed between atoms of the same element will be polar.
D. The bonds between O and H in a water molecule is a polar covalent bond.
E. Hydrogen bonds are polar covalent bonds.
A hydrogen atom had an atomic mass of 2. You can conclude that:
A. It must be radioactive (unstable).
B. It had two protons in its nucleus.
C. It has one proton and one neutron in its nucleus.
D. It consists of one proton and one electron.
E. Water made with this type of hydrogen, plus normal oxygen, would have a molar need of 18 g/mol.
Which of these is a correct statement about the biological macromolecules?
A. Fatty acids are made by translating the information for that fatty acid from RNA.
B. Polypeptides derive their primary structure from information originally found in DNA.
C. DNA is made in most cells by copying RNA.
D. Genes directly determine the order of monomers in a polysaccharide.
E. All of the above
A very acidic solution has a pH of 1. The concentration of [H+] ions is: A. 0.1 M B. 10^-13 M C. 1 M D. 10 M E. 10^13 MA. 0.1 MWhich type(s) of isomer exist(s) for the molecule shown below? A. cis-trans and structural B. Cis-trans, structural, enantiomer C. Cis-trans only D. Structural only E. Structural and enantiomersA. cis-trans and structuralHow many asymmetric carbons are in the molecule shown here? A. 5 B. 4 C. 3 D. 4 E. 3D. 2An atom with 12 protons and 13 neutrons has an overall charge of +1. How many electrons are in its outermost electron shell? A. 1 B. 8 C. 2 D. 4 E. 3A. 1For which of the following does a gene exist? A. chitin B. glucose C. insulin D. cysteine E. All of theseC. insulinWhich of the following shows the correct structure of a dipeptide? A. B. C. D. E.A carbon atom is joined to -CH2-CH2-CH2-CH2-CH3, =O, and -OH. The molecule: A. is a ketone B. has an asymmetric carbon C. is a hydrocarbon D. is an aldehyde E. is a fatty acidE. is a fatty acidWhich of the following correctly pairs a molecule with the type of linkage in a polymer of that molecule? A. fatty acid - glycosidic linkage B. amino acid - disulfide bridge C. monosaccharide - ester D. nucleotide - phosphodiester E. fat molecule - hydrogen bondD. nucleotide - phosphodiesterIn the folding of proteins, secondary structure is the result of: A. Hydrogen bonds between functional groups in the polypeptide backbone. B. Covalent bonding between C and N atoms in the polypeptide backbone. C. The linear sequence of the amino acids that make up the polypeptide. D. The attractive interactions that take place among multiple polypeptides. E. Non-covalent interactions among side chains of different amino acids.A. Hydrogen bonds between functional groups in the polypeptide backbone.Which of the following is correct about how scientists currently understand the structure of atoms? A. The positions of electrons follow a probability distribution or cloud. B. Protons and neutrons have opposite charges, which keeps them together in the nucleus. C. Neutrons are found in pairs in particular zones called orbitals. D. Protons, electrons, and neutrons have different charges but similar masses. E. Electrons move in a circle around the nucleus, like planets around a sun.A. The positions of electrons follow a probability distribution or cloud.In a proton of 22Na, a proton decays into a neutron. Assuming that the nuclear particles stay together, how many neutrons are found in the resulting atom? A. 10 B. 23 C. 11 D. 12 E. 22D. 12Which of the molecules shown here has chemical formula C4H8O? A. 3 only B. 2 and 3 C. 1 only D. 1, 2, 3 E. 1 and 3B. 2 and 3The diagram at right shows: A. amino acid side chains interacting in a polypeptide B. hydrophobic interactions between fatty acid tails C. bonds that stabilize protein secondary structure D. hydrogen bonds that strengthen cellulose fibers E. base pair interactions between polynucleotide chainsD. hydrogen bonds that strengthen cellulose fibersMonosaccharides are classified by all of the following except: A. the total number of carbon atoms present. B. orientation of the functional groups around C=C bonds. C. which carbon the carbonyl is on, in the linear form D. orientation of -OH groups based around asymmetric carbons E. All of the aboveB. orientation of the functional groups around C=C bonds.We could draw a monosaccharide by starting with a straight-chain hydrocarbon, then: A. Making one C-C bond into a C=C double bond, then filling all carbons with -OH. B. Turning one of the carbons into an O, then adding -OH to the remaining carbons C. Adding an -OH to each of the carbon atoms, then making the last one a carboxyl D. Putting hydroxyls on all carbons except one, where we put a carbonyl instead E. Placing an -OH onto every carbon, then joining the end carbons to make a ringD. Putting hydroxyls on all carbons except one, where we put a carbonyl insteadLiquid gasoline used in cars contains octane, C8H18. You can predict that octane: A. Can form a homogeneous mixture with water B. Forms a network of hydrogen bonds with itself C. Would not interact with a polar solvent D. Has a single C=C double bond E. Has more than one C=C double bondC. Would not interact with a polar solventIf R = ribose, N = nitrogenous base, and P = phosphate, which of the following best represents the arrangement of these components in a strand of RNA? A. B. C. D.In nucleic acids, a base pair: A. Consists of two bases next to each other on the same strand. B. Is formed by either two pyrimidines paired together, or two purines paired together. C. Results from a covalent interaction between sugar groups in two strands. D. Is stabilized by hydrogen bonding between functional groups. E. Is the same as a nucleotide containing two phosphatesD. Is stabilized by hydrogen bonding between functional groups.A DNA molecule has sequence 5'-GAATCCA-'3. The molecule that could properly form base pairs with this molecule is: A. 5'-GAATCCA-3' B. 5'-GTTCGGA-3' C. 5'-ACCTAAG-3' D. 5'-CTTAGGT-3' E. 5'-TGGATTC-3'E. 5'-TGGATTC-3'Which is a correct statement about fats? A. Triglycerides with no double bonds are called unsaturated fats B. A long hydrocarbon chain that ends in -COOH is called a fat C. Partial hydrogenation of cis fats can turn some into trans fats D. Trans fats have only single bonds, while cis fats have double bonds E. Fats have a three-carbon monosaccharide (C3H6O3) at their coreC. Partial hydrogenation of cis fats can turn some into trans fats