Eukaryotic chromosomes differ from bacterial chromosomes because only eukaryotes have

A. chromosomes in a nucleus.
B. histone proteins.
C. several to many chromosomes.
D. elongated, not circular, chromosomes.
E. All of the choices are correct.


Answer: E

Biology & Microbiology

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Imagine that fur length in a chinchilla species is a polygenic trait controlled by at least three genes. For each of these genes, long fur (PL, QL, or RL) has incomplete dominance over light (PS, QS, RS). A chinchilla homozygous for long fur is mated with a chinchilla that is homozygous for short fur. What will be true of their offspring?

A. 1/4 will be homozygous for long fur, 1/4 will be homozygous for short fur, and 1/2 will be heterozygous. B. 1/2 of their offspring will have long fur, 1/2 of their offspring will have short fur. C. 1/2 of their offspring will be homozygous for long fur, 1/2 of their offspring will be homozygous for short fur. D. All of their offspring will have intermediate-length fur. E. All of their offspring will have long fur.

Biology & Microbiology

Which of these features is found in both nonvascular and vascular plants?

a. lignin b. roots c. cuticle d. xylem e. phloem

Biology & Microbiology

Current treatments for human genetic diseases include all of the following except

a. restricting a dietary substrate. b. replacing the mutant gene in all cells. c. alleviating the patient's symptoms. d. inhibiting a harmful metabolic reaction. e. supplying a protein that is missing.

Biology & Microbiology

Which of the following cavities has the highest density of cardiac muscle tissue?

A) thoracic cavity B) cranial cavity C) abdominal cavity D) pleural cavity

Biology & Microbiology