The only group with an endoskeleton is

Biology

1 answer:

DiKsa [7]3 years ago

5 0

The only group with an endoskeleton is A or D because you put the same answer choice twice

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What is the regulatory mechanism that allows<br> e.coli to ignore lactose when glucose is present?

Dovator [93]

Answer:
The regulatory mechanism that allows E.coli to ignore lactose when glucose is present is controlled by Lac Operon.

Explanation:
Lac operon is inducible and and normally turn off. It contain genes responsible for lactose metabolism and expressed when lactose is present and glucose is absent.

Structure of Lac Operon:
Lac operon is composed of following parts as shown in the figure:

1. Catabolic activator protein (CAP):
It acts as glucose sensor and activate transcription of operon through hunger signal (cAMP) when glucose level is low.

2. Promoter:
It is binding site for RNA polymerase enzyme, that start transcription.

3. Operator:
It is binding site for Lac repressor protein. when there is no need of lactose repressor protein bind to promoter and stop transcription.

4. Structural genes:
This region is composed of Lac Y, Lac Z and Lac A genes. These genes are transcribed into lactose when needed.

Regulatory mechanism
When glucose is present, no cAMP is made. CAP can't bind DNA with out cAMP, so transcription occur at only low rate or stop.

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3 years ago

Assume a cell with the following properties: [Na]out = 120 mM; [Na]in = 12 mM [K]out = 5 mM; [K]in = 125 mM Membrane is permeabl

ArbitrLikvidat [17]

Answer:

This statement is not correct because the Na+ equilibrium potential remains the same, it is only depends on concentration gradient.

Explanation:

Na+ influx will increase, but Na+ equilibrium potential will not change because the concentration of K+ ions are high inside the membrane and that of Na+ ions are high too outside the membrane. Membrane potential will be generated that helps in the diffusion of the ions through the pore in both in and outside of the cell. When the concentration of Na+ ions increase, Na+ ions diffuse from outside to the inside of the cell therefore increase the influx

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4 years ago

How do molecules in certain molecular compounds come to have a slight electrical charge ?

solong [7]

Atoms of some elements pull more strongly on shared electrons than do atoms of other elements, as a result, the electrons are pulled more toward one atom, causing the bonded atoms to have a slight electrical charge.

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If two diverse species are genetically similar, the fossil record will likely show that..

uysha [10]

The two species probably had a common ancestor, but split and changed from evolution.

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3 years ago

Why is it important for a cell to be able to turn a gene off?

raketka [301]

A certain gene is only used for certain functions, and if that gene is always going, your body cant turn certain functions on and off, which can ultimately lead to a lot of health problems.

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4 years ago