UIL Academic_Science

The electron acceptor during the light-dependent reactions of oxygenic photosynthesis is

• NADPH.

• NADP^+.

• Water.

• ATP.

• Oxygen.

Which of the following best describes denitrification?

• The reduction of nitrate to nitrite and then to dinitrogen gas.

• The production of ammonium.

• The incorporation of dinitrogen gas to produce ammonium.

• The production of ammonium by decomposers.

The most abundant leukocyte in human blood is the

• neutrophil.

• basophil.

• eosinophil.

• lymphocyte.

• monocyte

Muscle cells contain large calcium storage organelles SPECIFICALLY called

• vacuoles.

• Golgi bodies.

• Sarcoplasmic reticula

• rough endoplasmic reticula.

• smooth endoplasmic reticula.

Reproductive isolating mechanisms that occur after fertilization include all of the following except

• post-zygotic mechanisms.

• hybrid sterility.

• nonviability of hybrids.

• hybrid breakdown.

• temporal isolation.

RNA polymerase recognizes a/an_______ and begins the process of

• origin; replication.

• Shine-Dalgarno; translation.

• promoter; transcription.

• promoter; translation.

• activator site; transcription.

The directed movement of organisms towards an attractant is called

• conditioning.

• kinesis.

• turgor.

• taxis.

• a learned response.

The role of leukocytes in the body is to

• clot blood.

• transport respiratory gases.

• store carbohydrates.

• fight infection.

• generate more blood cells.

A ribosome is to proteins as _________ is to DNA.

• RNA polymerase.

• DNA polymerase

• DNA helicase

• a nucleus

• replication

If red (R) is dominant to white (r), what percentage of offspring will be red in the second filial generation (F(subscript 2)) from the following cross?

RR x rr

• 0%

• 25%

• 50%

• 75%

• 100%