Although the carrying capacity of a population is determined by food availability, what other factor affects the carrying capacity?
A) the energy fluctuations of the sun
B) clean air and water
C) the prevalence of war
D) a woman's choice to not have children
B
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Which system involves plasma proteins activated when they contact a bacterial cell?
a. infection b. complement c. bodyguard d. enhancer e. defender
Cas9 endonuclease differs from a restriction enzyme in that ________.
A. restriction enzymes recognize a 4-8bp target sequence in the DNA and directly cleave at that site, whereas Cas9 contains a guide RNA that is complementary to a specific DNA site and a polypeptide that cleaves once hybridization is complete B. restriction enzymes recognize 4-8bp sequence of the DNA, whereas the amino acids in Cas9 recognizes sequences that are approximately 20bp in length C. Cas9 recognizes a 4-8bp target sequence in the DNA and directly cleave at that site, whereas restriction enzymes contain a guide RNA that is complementary to a specific DNA site and a polypeptide that cleaves once hybridization is complete D. restriction enzymes can cleave any loci in the DNA molecule, whereas Cas9 can only cleave DNA fragments that originated as mobile genetic elements such as phages and transposons
Which of the following best describes an embryo in a seed after it has been fertilized?
a. It begins as a sporophyte and ends up as a gametophyte before germination. b. It is usually a gametophyte but can be a sporophyte. c. It is always a sporophyte. d. It is always a gametophyte.
In about 9 months, a human develops from a fertilized egg into a fully formed human. During which phase of pregnancy do the lungs complete development?
A) second trimester B) third trimester C) after birth D) first trimester