When plants of a particular species are growing too close to each other, crowding may eventually lead to mortality, known as self-thinning. This type of mortality is:
a. density dependent.
b. density independent.
c. exponential.
Ans: a. density dependent.
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Jane is a 20-year-old individual who externally resembles a female but who is actually genetically a male (XY). Based on your knowledge of human development, how could this be possible?
A) Although Jane is genetically a male, she has produced an abnormal amount of estrogen since birth. B) During development, Jane's body produced an excessive amount of testosterone, leading to the development of female external genitalia. C) Jane's embryonic gonads did not produce androgens, or they lacked functional testosterone receptors. D) Due to a genetic defect, Jane lacks sufficient aromatase activity, the enzyme that converts testosterone into estrogen.
In mRNA codons: UUU = phenylalanine, GUU = valine, UAU = tyrosine, UGU = cystine, GGU = glycine. If the third amino acid in a protein were valine, the codon sequence for that amino acid would be
A. UAU. B. GGU. C. UUU. D. GUU.
At which stage of meiosis are sister chromatids separated from each other?
a) anaphase II b) prophase I c) prophase II d) anaphase I
________ can be used to transfer DNA to plant cells because it contains ________
a. Escherichia coli / lambda phage b. An insect cell line / baculovirus c. Bacillus thuringiensis / Bt toxin d. Agrobacterium tumefaciens / the Ti plasmid