Suprise Quiz Bioch&Biol

Why must the development of photosynthesis have preceded the development of oxidative phosphorylation?

• Because oxidative phosphorylation depends on atmospheric oxygen

• Because photosynthesis occurs first in the mitochondria of eubacteria

• Oxidative phosphorylation produces ATP and photosynthesis produces carbohydrates, thus, they are independent processes

• This question remains an unsolved question

Mitochondria are thought to have originated from endosymbiosis of _______ by a large host cell.

• Anaerobic bacteria

• Photosynthetic eubacteria such as cyanobacteria

• Fungi such as yeast

• Non-photosynthetic aerobic bacteria

The nuclear basket protein complex is a component of the nuclear pore complex found

• inside the nucleus.

• buried in the nuclear envelope.

• on the cytoplasmic face of the pore.

• lining the central channel of the pore

Which statement about heterochromatin is false?

• It is highly condensed chromatin.

• Contains highly repeated DNA sequences.

• It is transcriptionally active.

• It is largely localized to the nuclear periphery

Indicate which of the following amino acid groups are aromatic:

• Phenylalanine, Tyrosine, Tryptophan

• Phenylalanine, Alanine, Tyrosine.

• Histidina, Lysina, Arginine.

• Glutamine, Arginine, Glycine.

Which of the following lipids is saponifiable?

• Thromboxane A2.

• Prostaglandin E1.

• Phosphatidylcholine.

• Retinol

A monosaccharide of 6 C, 4 of them asymmetrical, which is part of sucrose is the ...

• D–Galactosa.

• D–Glucose.

• D–Fructose

• L–Glucose

The factor that escorts the aminoacyl tRNA to the ribosome and then releases it with GTP hydrolysis following the correct codon–anticodon base pairing is

• eIF1

• eRF1

• eIF2

• eEF1a

Pseudogenes are

• genes that code for an RNA but do not code for a protein

• nonfunctional gene copies

• inactive genes

• genes containing variant sequences

The directionality of nuclear transport is determined by (1)____ in the nucleus and (2)_____ in the cytosol.

A)

B)

C)

D)

• (1) high Ran; (2) low Ran

• (1) low Ran; (2) high Ran

• (1) high Ran/GTP; (2) high Ran/GDP

• (1) high Ran/GDP; (2) high Ran/GTP