All of the following are true regarding eukaryotic chromosomes EXCEPT

A) the DNA is tightly coiled around histone proteins.
B) the chromosomes are located in the nucleoid.
C) chromosomes vary in number from a few to hundreds.
D) chromosomes can occur in pairs or singles.


Ans: B) the chromosomes are located in the nucleoid.

Biology & Microbiology

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What is the flash pattern used by female fireflies to attract males of their species an example of?  

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Biology & Microbiology

Which of the following is responsible for the increase in girth (width) of trees?

A) primary growth B) secondary growth C) growth in apical meristems D) an increase in the width of vessel elements

Biology & Microbiology

Shrews have been documented to travel across frozen lakes and establish populations on previously uninhabited islands. The low level of genetic diversity in the new populations is the result of

A) genetic drift. B) a population bottleneck. C) coevolution. D) the founder effect. E) assortative mating.

Biology & Microbiology

Which of the following statements correctly describe(s) T tubules and their role in conducting action potentials in muscle cells?

A. T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na+ and K+ channels. B. T tubules lack the voltage-gated Na+ and K+ channels that are present in the plasma membrane. C. T tubules are infoldings of the plasma membrane that encircle the myofibrils and are in contact with the sarcoplasmic reticulum. D. Without T tubules, the muscle cell would not be able to contract. E. T tubules are extensions of the sarcoplasmic reticulum that are in contact with the plasma membrane. F. T tubules have receptor proteins that bind neurotransmitters released from the synaptic terminal of the motor neuron.

Biology & Microbiology