Quaking aspen can send out underground stems for asexual reproduction. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. How many chromosomes are in the cells of the underground stems?
A) 9
B) 10
C) 19
D) 38
D
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The modern scientific field of evo-devo is based on observations that:
A. a relatively minor number of mutations leading to changes in regulatory patterns during development can fuel surprisingly rapid evolution. B. very complex organisms do not necessarily have more genes than simpler organisms. C. very different species have surprisingly similar types of genes. D. All of the choices reflect observations upon which evo-devo is based.
Fertilization leading to a viable pregnancy in mammals occurs in the
a. ovary. b. uterus. c. vagina. d. oviduct. e. follicle.
Which was common to experiments done by Avery and colleagues as well as Hershey and Chase?
A. Bacterial cells B. Radioactive DNA C. Virulent bacteriophage D. Radioactive protein E. Escherichia coli
Which of the following is TRUE of spirochetes?
A) They are peritrichous. B) They are Gram-positive. C) They are able to penetrate a host's tissues. D) They are obligate intracellular organisms. E) They are pleomorphic.