AnswersBiologyN/A

Practice Exam Answers

28 verified answers
1
Free Preview

Which flow chart correctly organizes the structures of heredity, from least to most complex?

A
gene rightarrow chromosome rightarrow codon rightarrow DNA
B
chromosome rightarrow DNA rightarrow gene rightarrow codon
C
codon rightarrow gene rightarrow DNA rightarrow chromosome
D
DNA rightarrow codon rightarrow chromosome rightarrow gene
2
Free Preview

The structure of DNA resembles a twisted ladder. Which structural components form the rungs of the ladder?

A
ribosomes
B
nitrogenous base pairs
C
phosphate groups
D
deoxyribose sugars
3

Which structure will form when a primitive cell engulfs an aerobic bacterium?

A
cell membrane
B
nucleus
C
mitochondria
D
chloroplast
4

What does a karyotype show?

A
carriers of a genetic disorder in a family
B
relationships among family members
C
alleles on each chromosome
D
genetic abnormalities
5

Which accurately describes the relationship between cancer risk and exposure to mutagens?

A
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations increases as well.
B
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutation decreases as well.
C
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations decreases considerably.
D
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutations increases considerably.
6

What purpose does the peptide bond serve in protein synthesis?

A
It adds a water molecule to the amino acid chain.
B
It makes a strand of mRNA.
C
It connects amino acids.
D
It releases the protein from the tRNA.
7

How does a catalyst influence a chemical reaction?

A
It increases the total amount of products formed.
B
It reacts with products to increase the concentration of reactants.
C
It speeds up or slows down a chemical reaction by direct participation.
D
It decreases the amount of energy necessary for the reaction to proceed.
8

Which blood type could be given as a transfusion for patient with AB blood when the RH factor is unknown?

A
AB–
B
AB+
C
O+
D
A+
9

Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?

A
endoplasmic reticulum
B
cytoplasm
C
cell membrane
D
mitochondrion
10

Which best illustrates the result of the process of meiosis?

A
A daughter looks different from both her mother and her father.
B
A Labrador puppy looks exactly like its father.
C
A cheetah cub has very similar fur to its mother.
D
A pea plant has the same flower color as its parent plants.
11

Which compound contains a triple bond?

A
Image with description 2 C's are connected with a single line, and each has an H attached by a single line above, below, and outside.
B
Image with description 2 C's are connected by 3 parallel lines. There is an H connected with a single line to the left and to the right.
C
Image with description A C is connected to an O with 2 parallel vertical lines, and below left to H with a single line and below right to O H with a single line.
D
Image with description 2 C's are connected with 2 parallel lines. There are H's connected with single lines above left, above right, below right, and below left of the 2 C's.
12

Two cells in the same organism differ only in the number of chloroplasts they contain. The first cell has multiple chloroplasts, and the second cell has very few. What would most likely characterize these cells?

A
The second cell would shrink because it would not be able to store water and maintain cell shape.
B
The second cell would become larger because it would have fewer chloroplasts regulating its size and shape.
C
There would be no difference between the functioning of the cells because the chloroplasts are not essential cell structures.
D
The second cell would not be able to produce as much food because it could not capture very much sunlight.
13

What do all cellular activities in living organisms use as a source of energy?

A
carbon dioxide
B
ATP
C
lactic acid
D
pyruvic acid
14

The concentration of sodium on the inside of the cell is 20 mM. The outside of the cell has a sodium concentration of 115 mM. Which mechanism of ion uptake would best move sodium from the inside of the cell to the outside?

A
diffusion
B
osmosis
C
passive transport
D
active transport
15

Which statement best distinguishes the light-dependent (L-D) reactions from the light-independent (L-IND) reactions?

A
The L-D reactions occur in the chloroplast, and the L-IND reactions occur in the mitochondria.
B
The L-D reactions occur in the cytoplasm, and the L-IND reactions occur in the chloroplast.
C
The L-D reactions occur in the stroma, and the L-IND reactions occur in the cytoplasm.
D
The L-D reactions occur in the thylakoid membrane, and the L-IND reactions occur in the stroma.
16

A plant that has round and yellow seeds (RrYy) is crossed with a plant that has round and yellow seeds (RrYy). What is the ratio of the offspring that will have round and yellow seeds? Key: R is equal to round r is equal to wrinkled Y is equal to yellow y is equal to green

A
1 : 16
B
3 : 16
C
8 : 16
D
9 : 16
17

Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?

A
The child may or may not have the disease because a recessive gene from each parent may be passed on.
B
The child will have the disease because only recessive alleles will be passed on.
C
The child cannot have the disease because only the dominant alleles will be passed on.
D
The child may or may not have the disease because the disease does not depend on the alleles of the parents.
18

Which statement best describes the process of chemiosmosis and the direct result of its occurrence?

A
Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.
B
Hydrogen ions flow from the stroma down a concentration gradient through ATP synthase channels into the thylakoid. ADP is converted to ATP.
C
Hydrogen ions flow from the thylakoid against a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.
D
Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ATP is converted to ADP.
19

By which process do plants obtain carbon from the atmosphere?

A
photosynthesis
B
decomposition
C
consumption
D
cellular respiration
20

Corn can be injected with herbicide-tolerant recombinant DNA. Which type of organism is herbicide-tolerant corn?

A
recombinant organism
B
infertile organism
C
purebred organism
D
transgenic organism

Did you find these answers helpful?

More from this Course

Quiz
50 verified answers

Exam

Quiz
25 verified answers

Test

Quiz
24 verified answers

Test