BIOLOGY HIGH SCHOOL

Usually flowers contain more stamens than pistil . Why?

Answers

Answer 1
Answer: because the stamen is more important 

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Scientists today can use many experimental methods to study evolution. Which method was developed after Darwin’s time?DNA comparisonsobservationsfossilsexperimentation

Answers

DNA comparisons was developed after Darwin's time and have become an important method for studying evolution.

While Darwin was able to make observations of variation and adaptation in different species, he did not have access to the genetic information that DNA provides. It wasn't until the discovery of the structure of DNA in 1953 that scientists began to explore the use of DNA in studying evolution.

Since then, DNA sequencing and comparisons have become increasingly important tools in the study of evolutionary relationships and processes.

In science, DNA comparison is a ground-breaking technology. It has given researchers the ability to compare and contrast DNA samples with previously unheard-of accuracy.

Researchers can learn a great deal about genetic links and diseases as well as create brand-new remedies for illnesses by examining these traits.

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Dr. Evil administers a toxin that disrupts ribosomal RNA (rRNA) synthesis in the cell above. Which labeled structure would be most negatively impacted by this toxin? 1) None of these labeled structures would be negatively impacted. 2) Structure B 3) Structure C 4) Structure D

Answers

Answer:

Well for this question it is necessary that you upload the image.

Although I would tell you that whenever mRNA is affected, protein synthesis is one of the most important and relevant causes in cell life.

Explanation:

Another fact to add is that according to the protein that is selected, determine the vitality or not of the cell.

In the inoculation of the toxin if the synthesis of a protein that makes up the membrane structure, or of the fundamental structures for vitality, is affected, the cell will go into apoptosis or die.

On the other hand, if the protein synthesis is referred to some enzyme, or a second protective messenger, the cell continues with its vitality.

Are recessive forms of genes always visible in offspring? Or do visible traits depend on the dominant and recessive forms of genes from each parent.

Answers

No, they aren't always visible. It depends if its heterozygous or homozygous. Homo- 2 of the same gene. Ex. RR or rr Heter- both genes are different. Ex Rr

Check all of the following which could describe the first interaction of the acquired immune system to an infection. A. Binding to IgM B. Activation of complement proteins C. None of the above D. Binding to IgG E. Stimulation of T-cell by APC

Answers

E. Stimulation of T-cell by APC

The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination.  However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it and rapidly spring into action triggering a much more rapid response specific to that pathogen than the initial exposure, effectively dealing and neutralizing the pathogen.

After ovulation, the oocyte:A. waits passively for a sperm to penetrate.
B. releases negative ions that create an electrical gradient that all sperm swim toward.
C. releases chemotaxic signals to attract sperm to its location.
D. propels itself toward seminal fluid by calcium-dependent kinesis.

Answers

Answer:

C. releases chemotaxic signals to attract sperm to its location.

Explanation:

An oocyte  is female gametocyte which is involved in the reproduction. It  is produced in ovary during the female gametogenesis. After ovulation, during luteal phase, egg is available to be fertilized by the sperm.

Sperm are attracted toward the eggs by the process of chemotaxis which is  by following the gradient of chemical secreted by egg.

Thus, the oocytes in the female body control not only type of sperm they want ot attract, but also time at which they attract them.

How is it possible to have thousands of different proteins when there are only 20 different amino acids

Answers

The 21 amino acids can be arranged in many different ways. It is possible with just this small number of amino acids to create thousands of different types of proteins. Think of amino acids like they were little connecting blocks, such as legos. You have 21 of them before you. How many different ways can you arrange them? The formation of protein is similar. 
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