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Romashka [77]
3 years ago
6

In the term trace element, the adjective trace means that

Biology
1 answer:
Margarita [4]3 years ago
7 0

Answer:

The elemental is required in very small amount. (Ans. A)

Explanation:

Trace element is also known as micro-nutrient. It is also defined as any chemical element required by living organisms in a minute or small amounts which is usually part of the vital enzyme (cells produced by catalytic protein).

Exact needs of trace elements vary among species, like commonly required plant trace elements are cooper, zinc, manganese, boron, and molybdenum. Animals commonly required iodine, manganese, and cobalt.

Absence of necessary plant trace elements required by plants in the soil causes deficiency disease, lack of animal trace elements used by animals in the soil may not harm plants, but, animals feeding on those plants develop their deficiency disease.

So, the adjective trace means that the elemental is required in a very small amount.

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Revolutionary War soldiers made their own musket balls by melting lead (Pb). How much energy
Sati [7]

Answer:

Q = 813.12 j

Explanation:

Given data:

Mass of lead = 21 g

Initial temperature = 25°C

Final temperature = 327.5°C

Amount of heat absorbed by lead = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

ΔT = 327.5°C - 25°C

ΔT = 302.5°C

Specific heat capacity of lead = 0.128 j/g.°C

Q = m.c. ΔT

Q = 21 g. 0.128 j/g.°C.302.5°C

Q = 813.12 j

3 0
3 years ago
George on one pair of his chromosomes has STRs of lengths 6 and 7, Stephen (his father) STRs of lengths 3 and 6, and Mary (his m
JulijaS [17]

Answer:

Stephen is not his biological father.

Explanation:

DNA fingerprinting is a technique use to determine the DNA sequence of an individual organism. Short tandem repeats are unique among the individuals ans used to identify the individual in population.

The George DNA fingerprinting shows that he has STRs length of 6 and 7. Stephen's STRs does not match with his son George whereas Mary shows some similarities with George STRs. This indicates that Stephen is not the biological father of George because the biological father's STRs must match with the children STRs.

Thus, the correct answer is option (a).

4 0
3 years ago
The common subatomic particles that make up an atom consist of protons, neutrons, and ___ .
Alina [70]
Electrons (negatively charged subatomic particles)
5 0
2 years ago
Homework. Unanswered
Dennis_Churaev [7]

Gram-positive bacteria are bacteria that have thick cell walls which yield positive results in the Gram staining test. Lipoteichoic acid is a major component of the cell wall of gram-positive bacteria.

  • All bacteria indicated in the question can be classified by the Gram staining test:
  1. Actinomycetes are Gram-positive bacteria
  2. The genus <em>Arthrobacter </em>includes Gram-positive bacteria
  3. <em>Escherichia coli </em>(<em>E. coli</em>) is a Gram-negative bacterium
  4. <em>Staphylococcus spp.</em> are Gram-positive bacteria
  5. <em>Bacillus spp</em> are Gram-positive bacteria
  6. <em>Mycobacterium spp.</em> are Gram-positive bacteria

  • Prokaryotes can be divided into two domains: Bacteria and Archaea.

  • Gram staining is a method used to classify bacteria, but this method IS NOT USED to stain Archaea.

  • In consequence, I would not use the Gram test to stain Archaebacteria because Archaebacteria aren't bacteria (Option A is correct).

  • Archaebacteria belong to the Archaea domain.

Learn more in:

brainly.com/question/13756030?referrer=searchResults

6 0
2 years ago
Which statement best expresses a relationship between organic farming and conventional farming that is presented in the passage?
Leviafan [203]

Answer:

producing "sheer calories "

3 0
3 years ago
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