Biology

The partial sequence of a single DNA strand is shown. What will be the sequence of the complementary strand produced during DNA replication?

3′-ATGCTGAACT-5′

(A) 5′-ATGCTGAACT-3′
(B) 5′-CGTAGTCCAG-3′
(C) 5′-GACCTGATGC-3′
(D) 5′-GCATCAGGTC-3′
(E) 5′-TACGACTTGA-3′
Biology

Cyanobacteria are photosynthetic prokaryotes. Which organelles do cyanobacteria cells contain?

(I.) Chloroplasts
(II.) Nucleus
(III.) Ribosomes

 

(A) I only
(B) II only
(C) III only
(D) I and II only
(E) I and III only
Biology

Organisms that comprise the greatest mass of living substance (biomass) in a terrestrial food chain

(A) Decomposers (e.g., bacteria)
(B) Producers (e.g., grasses)
(C) Primary consumers (e.g., mice)
(D) Secondary consumers (e.g., snakes)
(E) Tertiary consumers (e.g., hawks)
Biology

Organisms that convert nitrogen-containing organic molecules into nitrates

(A) Decomposers (e.g., bacteria)
(B) Producers (e.g., grasses)
(C) Primary consumers (e.g., mice)
(D) Secondary consumers (e.g., snakes)
(E) Tertiary consumers (e.g., hawks)
Biology

A plant cell is placed in a hypotonic solution. As a result, the cell will

(A) lyse
(B) swell but remain intact
(C) shrivel
(D) remain unchanged
(E) take up solutes
Biology

In the graph above, the time when the number of living bacteria is increasing at the greatest rate occurs

(A) during the first 2 hours
(B) between the 2nd and the 4th hour
(C) between the 4th and the 6th hour
(D) between the 6th and the 10th hour
(E) between the 11th and the 13th hour
Biology

Which of these BEST describes the part of the molecule shown?

(A) It is hydrophilic.
(B) It forms the outer layer of the plasma membrane.
(C) It is composed of phosphate atoms.
(D) It contains nonpolar covalent bonds.
(E) It is capable of hydrogen bonding.
Biology

Which of these labels matches the structure of the partial RNA strand shown?

(A) I. phosphate; II. ribose; III. nitrogen base
(B) I. phosphate; II. nitrogen base; III. ribose
(C) I. nitrogen base; II. phosphate; III. ribose
(D) I. ribose; II. nitrogen base; III. phosphate
(E) I. ribose; II. phosphate; III. nitrogen base
Biology

In a breeding experiment using gray and white mice of unknown
genotypes, the following results were obtained.

If two gray progeny of cross IV mate with each other, what is the probability that any one individual offspring will be gray?

(A) 100%
(B) 75%
(C) 50%
(D) 25%
(E) 0
Biology

In a breeding experiment using gray and white mice of unknown
genotypes, the following results were obtained.

If the gray female from cross IV were mated with the gray male from cross II, then which of the following would most likely be true?

(A) All of the offspring would be gray.
(B) All of the offspring would be white.
(C) Half of the offspring would be gray.
(D) One-quarter of the offspring would be gray.
(E) One-quarter of the offspring would be white.