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
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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.
Which of these features is found in both nonvascular and vascular plants?
a. lignin b. roots c. cuticle d. xylem e. phloem
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.
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