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TLS Online TPP Program

#Question id: 4605

Over long periods of time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?

#XL - S Microbiology

  1. Natural selection cannot account for losses, but accounts only for new structures and functions.

  2. Natural selection accounts for these losses by the principle of use and disuse.

  3. Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.

  4. The ancestors of these organisms experienced harmful mutations that forced them to lose these structures.

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TLS Online TPP Program

#Question id: 11557

#XL - T Zoology

Which of the following has both endocrine and exocrine activity?
TLS Online TPP Program

#Question id: 2175

#XL - S Microbiology

 ABC superfamily proteins are thought to act as ATP-dependent flippases in transporting:
TLS Online TPP Program

#Question id: 2663

#XL - T Zoology

A ______________ is a collection of clones that, among themselves, contain all the DNA sequences of the organism.
TLS Online TPP Program

#Question id: 1592

#XL - S Microbiology

Which of these molecules is incorrectly paired with a source?
TLS Online TPP Program

#Question id: 3254

#XL - T Zoology

Consider a single locus with 2 alleles which are at Hardy-Weinberg equilibrium. If the frequency of the heterozygous genotypes is 0.42, what is the frequency of one homozygote in the population?