Which of the following body fluids does not transmit HIV from human to human?
A) blood
B) semen
C) saliva
D) vaginal fluid
E) breast milk
C
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According to genetic evidence, the migration of H. sapiens out of Africa replaced other human populations, including
Neanderthals and H. erectus, leading to their extinction. a. True b. Fals
The highly destructive form of Hansen's disease is the result of
A) poor immune response to Mycobacterium leprae. B) autoimmune disease triggered by Mycobacteriu leprae. C) intracellular infection with Clostridium botulinum. D) poor immune response to Streptococcus agalactiae. E) infection with rabies virus.
Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene-an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less). The allele for long eyelashes is dominant (L) and the allele for short eyelashes is recessive (l). An individual who is heterozygous for eyelash length would produce which of the following gametes?
A. Half of the gametes would have the L allele and half of the gametes would have the l allele. B. All gametes would have the l allele. C. The proportion of gametes receiving each allele would be random; the process of meiosis is very disorganized and chromosomes are not separated in an ordered fashion. D. All gametes would have the L allele. E. None of the gametes would have the eyelash gene; gametes do not have eyelashes.
In the Arabidopsis cdka;1 mutant the central cell of the female gametophyte is not fertilized. What structure will not form in these mutant plants?
A. endosperm B. pollen tube C. synergids D. egg cell