RNA has the nitrogenous base of uracil instead ofwhich is present in DNA.
A. adenine
B. cytosine
C. thymine
D. guanine

Answers

Answer 1

Answer:

Answer:

thymine

Explanation:

Though both RNA and DNA contain the nitrogenous bases adenine, guanine and cytosine, RNA contains the nitrogenous base uracil instead of thymine. Uracil pairs with adenine in RNA, just as thymine pairs with adenine in DNA.

Answer 2

Answer: answer is thymine because is DNA adenine pairs with thymine and cytosine always pairs with guanine, in RNA the only thing changed is that adenine pairs with Uracil

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What are examples of positive and negative control of the lac operon? Answer 1. Lactase, which breaks down lactose, is an example of positive control, and cAMP, which binds to CRP, is an example of negative control. 2. cAMP, which binds to CRP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control. 3. Lactase, which breaks down lactose, is an example of positive control, and glucose, which reduces cAMP, is an example of negative control. 4. Glucose, which reduces cAMP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control.

Answers

Answer:

4. Glucose, which reduces cAMP, is an example of positive control, and lactase, which breaks down lactose, is an example of negative control.

Explanation:

During positive control, the presence of Glucose results in the repression of expression of lac operon. This concept is known as catabolite repression. During negative control, the lac genes are switched off by repressor when the inducer is absent (indicating the unavailability of lactose). But when lactose is present, lac binds the repressor protein and modifies it in order to dissociate it from the operator. The removal of the combination of repressor and inducer helps lac to be transcribed and expressed.

Which of the following statements concerning animal taxonomy is (are) TRUE? 1. Animals are more closely related to plants than to fungi. 2. All animal clades based on body plan have been found to be incorrect. 3. Kingdom Animalia is monophyletic. 4. Animals only reproduce sexually. 5. Animals are thought to have evolved from flagellated protists similar to modern choanoflagellates.

Answers

Animal Kingdom comprises of eukaryotic, multicellular species of animals. Kingdom Animalia is monophyletic. Animals are evolved from flagellated protists similar to modern choanoflagellates.

What is Animal Kingdom?

Animal Kingdom includes organisms from simplest forms to the complex ones. All animals here are multicellular, eukaryotic and almost every animal is having specialised cells.

Some characteristics of animal kingdom includes:

Animals are more closely related to fungi than to plants.
Kingdom Animalia is monophyletic.
Animals are evolved from flagellated protists similar to modern choanoflagellates.
Animals have a unique feature namely, gastrulation.

Thus, option 3 and 5 are correct.

For more information about Animal Kingdom, visit:

brainly.com/question/14688752

Answer - 3) Kingdom Animalia is monophyletic

5) Animals are thought to have evolved from flagellated protists similar to modern choanoflagellates.

Please mark brainliest..

What is the role of enzymes primase in the DNA replication?A. Primase relaxes the DNA double helix so that other enzymes can reach the DNA.

B. Primase initializes replication by building short RNA primer complementary to the template.

C. Primase seals any gaps between Okazaki fragments or Fragments of DNA.

D. Primase is the enzyme that connects the ribosome to the DNA.

Answers

Answer:

primase relaxes the DNA double heliz so that other enzymes can reach the DNA

Explanation:

Answer:

Explanation:

Which offspring will be homozyguous dominant?

Answers

Homozygous means that both alleles (I and i are the alleles) are the same. You're given that I is dominant over i, so I is the dominant allele and i is the recessive allele. So organisms that are II and ii are homozygous. II is homozygous dominant while ii is homozygous recessive.
Heterozygeous, on the other hand, means that both alleles are different. In this case, Ii would be heterozygous.

To do this cross, write down the allele from each row and column in the box where they meet. Usually the dominant allele goes first if it's heterozygous. Select the box where you have two dominant alleles (II).

You should be selecting the bottom left box.

Homozygous dominant is when 2 dominant alleles are present. Solve the punnett square and whichever boxes have 2 dominant (uppercase/capitalized) letters in it are homozygous dominant

I cannot read the letters on your picture very well, I'm sorry.

Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to its resting potential by opening voltage-gated K+ channels, allowing K+ to flow out of the cell down its concentration gradient.(a) True
(b) False

Answers

Answer:

Explanation:

The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.

The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.

When the neurons get excited, the sodium ions start to enter by sodium channels.

Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.

When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.

But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2 potassium ions pumped into the cell through the plasma membrane.

Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.

Answer:

False.

Explanation:

Neuron or nerve cell may be defined as the structural and functional unit of the nervous system. The neurons conduct the nerve impulse and helps in the transmission of signals.

The depolarization of the cell occurs due to the influx of sodium ions into the cell. For the cell membrane to be in resting potential, the potassium ions moves inside the cell from outside the environment and not out of the cell of the organism.

Thus, the correct answer is option (b).

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