Biology-Midsem

A polar covalent bond between two atoms results from

• the presence of two ions close to each other

• whether the bond is single or not.

• two atoms that do not have similar electronegativities

• the shape of the molecule that has the bond

Exergonic reaction is the reaction proceeds with a net release of free energy.

• True

• Maybe

• False

The outer surface of smooth ER lacks ribosomes, whereas the outer surface of rough ER has ribosomes.

• True

• Maybe

• False

Which of the following is one of the molecules formed by the removal of a carboxyl group (as CO₂) from a molecule of pyruvate?

• citrate

• acetyl-coA

• ATP

• water

Which of the following molecules is the primary reducing agent in the Calvin cycle reactions?

• ATP

• NADH

• NADPH

• NADP+

The vascular cambium gives rise to

• all phloem

• secondary xylem and phloem

• all xylem

• primary xylem and phloem

What are the primary sites of auxin (IAA) production in plants?

• shoot apical meristem and young leaves

• seeds

• roots

• ripening fruit

Phytochrome plays a critical role in germination of some seeds. Which of these colors of light maximizes germination in these seeds?

• blue

• orange

• red

• violet