Why Is It Unlikely That DNA Was NOT the First

question 90

Multiple Choice

Why is it unlikely that DNA was NOT the first self-replicating molecule of life?

• A) nitrogen is essential for constructing DNA and there was no nitrogen on early Earth
• B) DNA is hyper-sensitive to oxygen and would have disassembled quickly in its presence
• C) DNA requires proteins like DNA polymerase for assembly so it doesn't truly "self-replicate"
• D) it must have RNA to self-replicate and RNA evolved much later in life's history
• E) more than one of these is correct

Understand the behavior of math instructions in PLC programming.

Identify the correct type of number result sent to the destination tag by math instructions.

Learn how to use MOV instruction to move contents between memory locations.

Solve problems involving MUL, ADD, SUB, and other arithmetic instructions.

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Definitions:

Variable Pointed

Refers to the specific variable or memory location that a pointer variable is currently pointing to.

Indirection Operator

A symbol used in programming (commonly the asterisk * in C/C++) to access the value at a memory address pointed to by a pointer variable.

Pointer

A variable in C and C++ that stores the memory address of another variable, allowing for direct memory manipulation.

Pointer Constant

A pointer whose address value cannot be changed after it is initialized.