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Bio FINAL Multiple Choice Questions
Terms in this set (27)
strong dipole-dipole type of interactions that occur among polar-covalent molecules containing H directly attached to one of the three small electronegative elements: O, N, or F - this statement refers to...
a hydrogen bond
what type of bond is present between H and H in a molecule of H2?
nonpolar covalent bond
when water evaporates, which bonds break?
When NaCl is present in water, although ion-ion interactions are stronger than ion-dipole interactions, water is able to dissociate the ions.
For this pair of items, choose the option that best describes their relationship:
(A) The number of alpha glucose 1-4 linkages in cellulose(B) The number of alpha glucose 1-4 linkages in starch
A is less than B
The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why?
the activation energy of the reaction is high
A molecule with the formula C18 H36 O2is probably a
saturated fatty acid
Molecules that are both attracted to water and repel water are called
Why do T and A only share two hydrogen bonds?
The C-H bond in adenine is too far away to form a hydrogen bond with the C=O bond in thymine.
Purine nucleotides can bond to pyrimidine nucleotides via
hydrogen and phosphodiester bonds
The base composition of a sample of a genome was found to be 11% A, 32% G, 18% U and 39% C. From what you know about nucleic acid composition, this sample is likely which of the following?
According to the central dogma of biology, the sequence of _______ codes for the sequence of ________ which codes for the sequence of __________.
DNA, RNA, amino acid
Cells were grown in culture providing them only nutrients with radioactive nucleotides. A few of these cells were transferred to new nutrient conditions with only non-radioactive nucleotides and allowed to undergo cell division thirty times.
Only a few cells will have any radioactive DNA, most will have entirely non-radioactive DNA.
Chromosomes and genes share all of the following characteristics except that
they both pair up with their homologues during prophase of mitosis.
Cellulase is an enzyme found in some microorganisms that hydrolyzes:
a polysaccharide found in plant cell walls
Which of the following are structural proteins?
chin and cellulose
The amino acids of the protein keratin are arranged in an a- helix. This secondary structure is stabilized by
hydrogen bonds between the peptide backbone
Which of the following protein structures is destroyed by denaturation?
secondary and tertiary
An aqueous protein contains amino acid "X" which is polar and amino acid "Y" which is non-polar. Based on this information, what do you predict are the most likely locations of these two amino acids in the protein?
Amino acid X is more likely to be on the exterior, and amino acid Y is more likely to be in the interior.
Which of the following molecules can enter an animal cell by passing through the plasma membrane without the aid of a transport protein?
Why does the rate of diffusion at high glucose concentrations level out?
The protein active sites are saturated with glucose
which of these experimental treatments would increase the rate of sucrose transport into the cell?
decrease the extracellular pH
Only certain cells in the body are target cells for the steroid hormone aldosterone. Which of the following is the best explanation for why these target cells are the only cells that respond to this hormone?
Only target cells contain receptors for aldosterone.
The sodium-potassium pump in neurons pumps
Na+ out, K+ in
Catabolism is to anabolism as _________________ is to____________________.
A typical competitive inhibitor of an enzyme-catalyzed reaction becomes inhibitory when it binds to:
the active site of the enzyme.
RNA polymerase and DNA polymerase differ in that
RNA polymerase must initiate RNA and DNA synthesis
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