How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?

#Question id: 1934

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a component that has often been used in chimeric antigen receptors (CARs)?

#Question id: 7217

#Unit 5. Developmental Biology

Following statements regarding to the metamorphic changes of frog development.

A. The metamorphic changes are brought about by the secretion of the hormone thyroxine (T4) into the blood by the thyroid gland

B. the conversion of T4 into the more active hormone tri-iodothyronine (T3) by the target tissues

C. the degradation of T3 in the target tissues

D. by the deiodinases enzymes T3 converted into T4 in target tissues.

Which of the following options are correct?

#Question id: 29470

#Unit 6. System Physiology – Plant

#Question id: 1779

#Unit 4. Cell Communication and Cell Signaling

Complement component C3 is cleaved by:

#Question id: 2820

#Unit 2. Cellular Organization

Multiple mRNAs can arise from a primary transcript by use of alternative

a. splicing.      b. poly(A) sites.                      c. promoters.               d. ribosome binding sites.