BIO 340 FINAL EXAM VERSION C NEWEST

• | P a g e

BIO 340 FINAL EXAM VERSION C NEWEST

2025 COMPLETE 100 QUESTIONS AND

ANSWERS (VERIFIED ANSWERS ) |ALREADY

GRADED A+

When closely related individuals mate with each other, or inbreed, the offspring are often not as fit as the offspring of two unrelated individuals. Why?

• Close relatives are genetically incompatible.
• The DNA of close relatives reacts negatively in the offspring.
• Inbreeding can bring together rare, deleterious mutations that

lead to harmful phenotypes.

• Inbreeding causes normally silent alleles to be expressed. -

ANSWER-c. Inbreeding can bring together rare, deleterious mutations that lead to harmful phenotypes.

Which statement about analogies is correct?

• They occur only as errors.
• They are synonymous with homologous traits.
• They are derived by similar environmental constraints. 1 / 4

• | P a g e

• They are a form of mutation. - ANSWER-c. They are derived

by similar environmental constraints.

What do scientists use to apply cladistics?

• homologous traits
• homoplasies
• analogous traits
• monophyletic groups - ANSWER-a. homologous traits

Why do scientists apply the concept of maximum parsimony?

• to decipher accurate phylogenies
• to eliminate analogous traits
• to identify mutations in DNA codes
• to locate homoplasies - ANSWER-a. to decipher accurate

phylogenies

In Griffith's experiments, what made the harmless R cells grow capsules when exposed to heat-killed S cells?

• Protein
• DNA
• Lipids 2 / 4

• | P a g e

• Polysaccharides - ANSWER-b. DNA

In the Hershey-Chase experiment radioactive Sulfur was used

to:

• Be incorporated into the phage DNA because of its numerous

sulfur atoms

• Be incorporated into the phage protein coat because of its

numerous phosphorous atoms

• Be incorporated into the phage DNA because of its numerous

phosphorus atoms

• Be incorporated into the phage protein coat because some

amino acids contain sulfur - ANSWER-d. Be incorporated into the phage protein coat because some amino acids contain sulfur

The experiments by Hershey and Chase helped confirm that

DNA was the hereditary material on the basis of the finding that:

• Radioactive phage were found in the pellet
• Radioactive cells were found in the supernatant
• Radioactive sulfur was found inside the cell
• Radioactive phosphorus was found inside the cell -

ANSWER-c. Radioactive sulfur was found inside the cell

• / 4

• | P a g e

If DNA of a particular species was analyzed and it was found that it contains 27 percent of adenine (A), what would be the percentage of cytosine (C)?

• 27 percent
• 30 percent
• 23 percent
• 54 percent - ANSWER-c. 23 percent

Four nucleic acid samples are analyzed to determine the percentages of the nucleotides they contain. Which of the following DNA sample(s) could be double-stranded DNA?

Sample 1: A(22%), G(28%), T(22%), U(0%), C(28%); Sample

2: A(30%), G(30%), T(0%), U(20%), C(20%); Sample 3:

A(18%), G(32%), T(0%), U(18%), C(32%); Sample 4: A(29%),

G(29%), T(21%), U(0%), C(21%)

• Sample 1
• Samples 1 and 2
• Samples 1 and 4
• Samples 2 and 3
• Samples 3 and 4 - ANSWER-c. Samples 1 and 4

Alternate forms of a gene are called _______.

• / 4