Which of the following elements is considered an essential macronutrient for plants?
a. oxygen
b. boron
c. lithium
d. silicon
e. molybdenum
A
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Virus replication only occurs
a. when conditions stress the virus. b. at regular intervals. c. inside a host cell. d. outside of eukaryote cells. e. when virus particles undergo binary fission.
A genetic library contains all the DNA fragments of
A. the entire genome of a species. B. a specific chromosome of a species. C. all the genes expressed in a certain cell type. D. any of these. E. none of these.
Judah Folkman performed an experiment in which he found that small tumors floating in the anterior chamber of the eye grew little, whereas a similar tumor implanted directly onto the iris grew to thousands of times its original size
These results supported his idea that continued tumor growth is dependent on requirement of tumor growth for A) continued exposure to a carcinogen. B) evasion of apoptosis. C) angiogenesis. D) metastasis. E) a stepwise series of gene mutations.
When hybrids in a hybrid zone can breed with each other and with both parent species and also have equal fitness to the parent species, one would predict that __________.
a. the hybrid zone will remain stable b. reinforcement of reproductive barriers will keep the parent species separate c. the species will fuse d. allopatric speciation will occur e. a new hybrid species will form by sympatric speciation