At times during a month, there is no moon visible from earth, even on a clear night. Which phase of the moon is this?

1 answer:

8 0

A new moon
Definition of new moon:
the phase of the moon when it is in conjunction with the sun and invisible from earth, or shortly thereafter when it appears as a slender crescent.

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What are neap tides? PLEASE HELPP!

nlexa [21]

A tide just after the first or third quarters of the moon when there is least difference between high and low water

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1 year ago

What sequence of bases on RNA would match, or pair with, the following DNA sequence: GCA?

Rudiy27

The sequence of bases on RNA that would match or pair with the following DNA sequence: GCA is CGU.

<h3>What is transcription?</h3>

Transcription is the process by which mRNA sequence is produced from a DNA template in the nucleus of a cell.

During transcription process, the following applies:

Adenine (A) pairs with Uracil (U)
Guanine (G) pairs with Cytosine (C)

This means that the mRNA sequence that will result from a template of DNA with sequence: GCA is CGU.

Learn more about DNA sequence at: brainly.com/question/3888340

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1 year ago

Which term means a malignant tumor composed of cells derived from hemopoietic tissues of the bone marrow?

Anon25 [30]

Haematopoietic and lymphoid malignancies are tumors that affect the blood, bone marrow and lymphatic system and all of those elements are very closely connected. Because of the connection between the circulatory and immune system, if one of the elements is affected it is very possible that the other will be affected too. Type of hematological malignancy includes:
1. Leukemias-cancers of white blood cells which usually begin in the bone marrow
2. Lymphomas-blood cancers developed from the lymphocytes
<span>3. <span>Myelomas-cancer of plasma cells (which produce antibodies).</span></span>

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3 years ago

7. Pyrethrums are chemicals used to kill insects. In bed bugs, the mutant-type allele, r, confers resistance, but only in homozy

natita [175]

Answer:

Allele frequency

Normal allele $= 0.9$

Mutant r allele $= 0.1$

Genotype frequency

Homozygous normal bugs $= 0.81$

Homozygous mutant bug $= 0.01$

Heterozygous normal bug with one mutant r allele and one normal allele $= 0.18$

Explanation:

It is given that 99% of the bugs were killed after the spray of pyrethrum. This suggests that 1% of the bugs that were not killed must be homozygous for the mutant type allele "r"

Thus, the frequency of homozygous "rr" species i.e $q^2 = 0.01$