When an individual of dominant phenotype but unknown genotype is crossed with one that is homozygous recessive, this is called a ________
a. testcross
b. monohybrid cross
c. codominant cross
d. dihybrid cross
a
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Match the correct case study in conservation biology with its animal.
A. fruit bats—introduction of new species B. prairie chickens—loss of genetic diversity C. songbirds—introduction of new species D. whales—pollution E. Lake Victoria cichlids—loss of habitat
A newly developed antibiotic drug shows promise by inhibiting prokaryotic 70S ribosomes in initial studies. However, when animal studies are begun, it's noted that it also inhibits growth of animal cells
Aren't prokaryotic ribosomes different from eukaryotic ribosomes? How can this be happening? A. Perhaps the ribosomes aren't as different as we thought, so a drug can affect and impair both of them. B. While the proteins made in the cytosol of eukaryotic cells are, indeed, produced from the 80S eukaryotic ribosome, mitochondria and chloroplasts possess 70S ribosomes. This drug might be impairing the activity of chloroplasts in animal cells. C. While the proteins made in the cytosol of eukaryotic cells are, indeed, produced from the 80S eukaryotic ribosome, mitochondria and chloroplasts possess 70S ribosomes. This drug might be impairing the activity of mitochondria in animal cells. D. Perhaps the scientists accidently combined their cultures of animal and bacterial cells-this might indicate an impairment in growth in the culture. In reality, it's still just impairing the bacterial cells.
Which of the following immune system cells is most severely depleted by HIV/AIDS ?
(A) Plasma B cells (B) Memory B cells (C) Helper T cells (D) Cytotoxic ("Killer") T cells
Answer the following questions true (T) or false (F)
1. People with genes for a form of hemoglobin known as hemoglobin C are at risk of fatal malaria disease. 2. Staphylococcus aureus is part of the upper respiratory microbiome. 3. Haemophilus influenzae is a common cause of sinus infections.