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pychu [463]
4 years ago
5

0cm3 of acid were mixed with 60cm3 of alkali in an insulated container. The average temperature of the two solutions before they

were mixed was 19.5°C. The temperature after mixing was 27.5°C. Was this an exothermic or an endothermic reaction?
Biology
1 answer:
Sloan [31]4 years ago
3 0

Answer: Endothermic reaction.

Explanation: An endothermic reaction is any chemical reaction that absorbs heat from its environment. In this reaction, the temperature of the mixture raised from 19.5°C to 27.5°C, which means there was an increase of heat, ergo, it is an <u>endothermic</u> reaction.

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As a cell grows larger and accumulates more contents, will it need more or less cell membrane to survive?
Ganezh [65]

Answer:

As the plasma membrane grows and accumulates more contents it will require more cell membrane to survive.

Explanation:

Plasma membrane is functionally significant layer that surrounds the cytoplasm of a cell.Plasma membrane performs many important cellular functions.For example transport of specific substance in and out of the cell,contain various protein that act as receptor,the oligosaccharide side chain of the glycoprotein moiety present within the plasma membrane recognizes various bio active compounds.

    When a cell grow it increases in size beside increasing its cellular constituents.To surround or protect these cellular constituents more plasma membrane should be need by the cell for its survival.

   

8 0
4 years ago
Achromoplast stores while a leucoplast stores A. starch; pigments B. chlorophyll; starch C. pigments; chlorophyll D. pigments; s
just olya [345]

Answer:

D. pigments; starch.

Explanation:

A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.

A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.

In a cell, the "workers" that perform various functions or tasks for the survival of the living organism are referred to as organelles.

A chromoplast can be defined as a heterogeneous organelle or plastids that is typically responsible for pigment synthesis and their storage in a plant. The pigments include red, orange, yellow or chlorophyll.

On the other hand, leucoplast is a colorless plastid i.e plastic lacking photosynthetic pigments that are typically found in storage organs, underground stems, cotelydons, roots, tubers, seeds, or endosperm etc., used for the storage of starch in the absence of sunlight.

Hence, a chromoplast stores pigments while a leucoplast stores starch.

5 0
3 years ago
Assume a population of purple and white flower pea plants (2000 total plants) is in Hardy-Weinberg equilibrium. The frequency of
lys-0071 [83]

Answer:

a) 0.48

b)

p= 0.4\\q=0.6

c) 720

Explanation:

Given ,

Frequency of white flower plant (p^2) is 0.16

Thus, frequency of dominant white allele (p) is equal to \sqrt{0.16} \\= 0.4

As we that, as per  Hardy-Weinberg equilibrium equation

p+q=1

Substituting the value of p in above equation, we get

0.4+q=1\\q=1-0.4\\q=0.6

a) As per Hardy-Weinberg equilibrium equation

p^2+q^2+2pq=1\\

Substituting the given and calculated values in above equation, we get -

0.4^2+0.6^2+2pq=1\\0.16+0.36+2pq=1\\2pq=1-0.16-0.36\\2pq=0.48

b) The frequency (decimal form) of the dominant allele

p= 0.4\\q=0.6

c) number of homozygous purple flower plants

= frequency of purple flower plants (q^2) * Number of flowers

= q^2 * 2000\\= (0.6^2)*2000\\= 0.36 * 2000\\= 720

8 0
3 years ago
Support irnas claim,using two pieces of evidence from the scientists experiment,figures 1 through 7, and both tables. Explain wh
Ulleksa [173]

Irina's claim is not found here but evidence from an experiment might include the amount of a product (chemical) or the order of nucleotides (biological evidence).

<h3>What is scientific evidence?</h3>

Scientific evidence refers to the observations that can be used to support (or reject) a working hypothesis.

Scientific evidence is variable depending on the field but it is always collected by observational or experimental procedures.

In conclusion, Irina's claim is not found here but evidence from an experiment might include the amount of a product (chemical evidence) or the order of nucleotides (biological evidence).

Learn more about scientific evidence here:

brainly.com/question/507522

#SPJ1

4 0
2 years ago
In an experiment, a scientist decides to study the effect of exercise on cholesterol levels in people. He studies two set of peo
Rina8888 [55]

Answer:

In the mentioned case, the statement that people who exercise for an hour may have lower levels of cholesterol is a hypothesis, and the cholesterol levels in the experiment would be the dependent variable.

Explanation:

A hypothesis is a suggested statement, that is, based upon the previous information, and is used as an initiation point in a scientific investigation.  

Any scientific experiments comprise two variables, that is, dependent and independent variables. The independent variable refers to the variable, which is controlled or modified in a scientific experiment in order to determine its influence on the dependent variable.  

4 0
3 years ago
Read 2 more answers
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