At these checkpoints a cyclin works with a cyclin-dependent kinase (i.e cdk) to regulate the checkpoint.
a. true
b. false
Ans: a. true
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What are the helper and inducer cells?
A. B cells B. macrophages C. plasma cells D. T cells E. monocytes
What is the term for organisms in which internally-fertilized eggs are laid to develop and hatch outside the mother's body?
A. placental B. viviparous C. oviparous D. marsupial E. ovoviviparous
Why did the alleles that conferred insecticide resistance in mosquitoes become less frequent in the population when insecticide application was discontinued in the 1960s in Thailand?
A) The mosquitoes experienced a bottleneck and by chance the surviving insects had a low proportion of resistance alleles. B) The resistance alleles were linked to a body color variation that led to resistant mosquitoes experiencing a higher rate of predation. C) A mosquito population with a low proportion of resistant alleles migrated to Thailand and interbred with the original population. D) In the absence of pesticide, mosquitos homozygous for the resistance alleles had lower fitness than the other genotypes.
In magnesium-deficient plants the older leaves show more severe symptoms of chlorosis which is a yellowing of the leaves than younger leaves. What is the best explanation?
A. There is more time for the symptoms to develop in older leaves. B. Scarce magnesium is removed from older leaves and translocated to support younger, more active leaves. C. Chlorophyll is transported from the older leaves to the younger leaves. D. Older leaves need less chlorophyll. E. Magnesium is more soluble in younger leaves.