Biology Answers

What does it mean that viruses are acellular?

Deduce and explain the effects of mutations:

a) in the operator, so that the repressor is no longer able to bind.

b) in lacI, so that the repressor is no longer synthesized.

c) in the promoter, so that RNA polymerase no longer binds.

d) in lacI, so that the repressor no longer binds to lactose.

e) in lacY that causes transcription to terminate in the middle of the gene.

f) location unknown, which prevents the lac mRNA from being degraded. 

Mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS) is a mitochondrial inherited disorder due to deficiency of either NADH/COQ reductase (Complex I cytochrome oxidase (Complex IV). Due to this lack of a functional mitochondria, what would the net ATP produced from one molecule of glucose? 6+2=8.

A. 0

B.1

2

D. 4

E. 8

A biology class was performing an experiment in the lab. The students had obtained a DNA strand with radioactive thymine. Later as they left the strand in a medium for multiplication, they realized that the radioactivity was observed only in part of the DNA and not all DNA molecules.The process was explained by the teacher as:

Why can't normal hydrogen bonding with nitrogenous bases of DNA occur when the molecule is in duplex/helix form?

how many lysosomes does one human liver contain?

What other different organisms may have similar body structures?

The maternal part of the placenta. Hemochorial barrier

The concept of cambial and non cambial tissues, the mechanism of their histogenesis

State the first and second law of thermodynamics