Which chemical produced by cancer cells promotes blood vessel growth?

a. angiogenin
b. interleukins
c. cytokines
d. HCG
e. thyroxine


ANSWER: a

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. In red-winged blackbirds, females tend to choose males with the most desirable territories and males compete with each other for territories. Redwing blackbirds demonstrate both intersexual selection and intrasexual selection. 2. Cryptic female choice is a type of intrasexual selection. 3. A population undergoing microevolution would show Hardy-Weinberg disequilibrium. 4. The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle and is an example of paedomorphosis.

Biology & Microbiology

Which of the following is in the correct order from smallest to largest structures?

a. myosin head, sarcomere, myofibril, muscle fiber b. sarcomere, myosin head, muscle fiber, myofibril c. myofibril, myosin head, sarcomere, muscle fiber d. muscle fiber, sarcomere, myofibril, myosin head

Biology & Microbiology

RNA polymerase binds to ________ before beginning transcription.

A) a promoter B) an operator C) a structural gene D) a replication origin E) the Shine-Dalgarno

Biology & Microbiology

Bordetella pertussis produces (adenylate cyclase/dermonecrotic/pertussis) toxin which disrupts blood supply to respiratory tissues

What will be an ideal response?

Biology & Microbiology