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Bio 189

Carbon fixation is taking place when plants

incorporate CO2 into sugars

which of the following is a transfer of genes between non-homologous chromosomes


The phenotype of an organism can be influenced by

both its environment and its genotype

in the cycling of energy and carbon through living things, plants and some other organisms use CO2 to make carbon-containing molecules,while other organisms break down those molecules and release CO2.During this process,CO2 is produced during ____ and used during______

cellular respiration; photosynthesis

photosynthesis is driven by the_____ light spectrum



the enzyme rubisco binds O2 during the calvin cycle

The sugar that first bonds with carbon dioxide in the calvin cycle is


Which of the following equations properly summarizes photosynthesis

6CO2+6H20+SUNLIGHT---> C6H1206+602

Which molecule is made in the nucleus but exists to function in the cytoplasm


Which of the following is the proper sequence of events in the gene expression

DNA---->mRNA---> protein

what products do plants produce during photosynthesis that is are used by humans and other animals?

glucose and oxygen

The replication of DNA molecule results in

two DNA molecules,each with one old and one new strand

what is being separated during anaphase of mitosis

sister chromatids

which cell structure physically moves the cell's chromosomes

the mitotic spindle

If a cell with 16 chromosomes undergoes mitosis,how many chromosomes will each daughter cell have


why is prokaryotic cell division fundamentally different from eukaryotic cell division

Prokaryotic cells have a single chromosome and no nuclear membrane

An autosomal recessive disorder

is more frequent in males than females

How many chromosomes are in a human gamete


A (2n (diploid) cell from an organism has 40 chromosomes. How many chromosomes would be in a haploid gamete from this organism


You have homologous pairs of chromosomes in each of your cells.In what way are these pairs of chromosomes identical

they have genes for the same traits

A and a are dominant and recessive alleles,respectively,of the same gene.Which genotype(s) would result in an individual with the dominant phenotype?

AA and Aa

Crossing over occurs during which stage of meiosis?

prophase I

What event occurs in both anaphase of mitosis and anaphase II of meiosis II?

sister chromatids separate

What is the result of recombination (crossing over)during meiosis?

it creates chromosomes that are a new combination of paternal and maternal material

what is the result of independent assortment during meiosis

genetically diverse gametes are likely to be produced

If the chromosome number were not halved when gametes are produced, what would be the result of fertilization

the zygote would have double the number of chromosomes as the parents

What is the term for an observable trait of an organism


The D gene controls pea plant height.The DD and dd genotypes confer tall and dwarf phenotypes,respectively. What is the relationship between D and d

They are different alleles of the same gene

Mendel crossed true breeding pea plants and found the dominant trait always appeared in the F1 generation, but it appeared in a ___ ration of dominant to recessive in the F2 generation


Cystic fibrosis (CF) is caused by a recessive allele.A child has CF, even though neither of his parents has CF.Which of the following describes the genotypes of the parents?

They are both heterozygous for the CF gene

Let S=smooth pea and s=wrinkled pea; Y yellow pea and y=green pea. What are the different possible genotypes of the gametes produced by a plant that is heterozygous for both characters?


Height is an example a character that displays continous variation in humans.What is the reason for the range of heights in humans?

Height is governed by the interaction of many genes

The site of photosynthesis in a cell is the


What are the products of the replication of one DNA molecule?

two identical double stranded DNA molecule

what is tje primary purpose of the light reactions of photosynthesis

to convert solar energy to chemical energy

A liver cell from a human male has

22 pairs of autosomes, an X chromosome, and a Y chromosome

Regarding the human sex chromosomes,which statement is correct?

The X chromosome carries more genes than does the Y chromosome

Which of the following is not a component of DNA nucleotides?


Red-green color blindness is an X-linked recessive trait in humans. A color blind woman and a man with normal vision have a son. What is the probability that the son is color blind

100 percent

A person who has recessive disorder but does not have the disorder him or herself is said to be a/an


what is the connection between sickle cell anemia and malaria

Heterozygous for sickle cell anemia have some resistance to malaria

What is one difference between polyploidy and aneuploidy

polyploidy is extra sets of chromosomes;aneuploidy occurs when there are either more or fewer chromosomes than normally exist in its species full set.

when a fragment breaks from a chromosome and rejoins it , in a flipped orientation the result is called a/an


Why are the strands of DNA said to be complementary to each other?

all the bases of one strand are paired up with their complementary bases on the other strand

How many different types of bases are used to encode all the genetic information in a molecule of DNA


The nucleotides in one strand of DNA are held together by:

links between the sugar of one nucleotide and the phosphate of the next

What is the complementary sequence for a segment of DNA with the sequence ACGGCT?


The two strands of a double helix of DNA are linked by what kind of bond?

hydrogen bonds between complementary bases

what is nondisjunction

failure of homologous chromosomes or before mitosis or meiosis

Why do X linked conditions appear more frequently in males than in females

A male with a nonfunctioning allele on the X chromosome does not have another allele of that gene on the Y chromosome that could cover up the nonfunctioning one

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